*{
  margin: 0;
  padding: 0;
}
ul{
  list-style: none;
}
body{
  background-color: #eee;
}
.content-container{
  width: 1000px;
  /* height: 500px; */
  background: white;
  margin: 0 auto;
  padding: 0 20px;
}
.tools{
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid #eee;
  height: 47px;
  line-height: 47px;
}
.tools>h4{
  border-bottom: 3px solid #1f73f3;
}
.tools>ul{
  display: flex;
  align-items: center;
}
.tools li{
  padding: 10px;
}
.tools select{
  border: none;
  color: gray;
}
.tools li.line{
  padding: 0;
  width: 1px;
  height: 20px;
  background-color: #eee;
}